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HEA - PYROMETERS, EARLY Dial micrometer, 1760-1772

IMAGE number
UIS5063054
Image title
HEA - PYROMETERS, EARLY Dial micrometer, 1760-1772
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Location
Science Museum, London, UK
Medium
object
Image description

HEA - PYROMETERS, EARLY Dial micrometer, 1760-1772. This is one of two micrometers made by Joseph Finney of Liverpool between 1760 and 1772. The micrometer acts as a form of pyrometer, measuring the elongation of a brass bar when heated and comparing it with the elongation of another material similarly heated. A mahogany bar was originally with the instrument, probably to compare the expansion of metal with that of wood. The bars would have been fixed securely to the mahogany frame at one end, and pressed against levers geared to the pointers which move over the dials at the other end. The dials enabled any expansion to be measured very precisely. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
Image keywords
temperature

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Largest available format 3504 × 2798 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3504 × 2798 px 297 × 237 mm 997 KB
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